Caution! well, this is rather peculiar. The Nasdaq stock market — the entire Nasdaq, which lists major tech firms such as Apple and Facebook — has temporarily suspended all trading due to a technical issue.

The exchange sent an alert to traders at 12:14PM ET today announcing that it was halting all trading “until further notice,” according to a New York Times report.

Reuters is reporting that Nasdaq will reopen trading soon, but with a 5-minute quote period. The market will not be canceling open orders, however, so firms that don’t want their orders processed once everything’s up and running should cancel their orders manually now.

However it’s not entirely clear what caused the issue, or how and when it will be resolved, but you better believe it’s causing some commotion on Wall Street, and could impact traders for days and months to come.